Answer:
"The man of la Mancha" refers to the famous fictional Spaniard known as Don Quijote de la Mancha.
Step-by-step explanation:
Don Quijote de la Mancha is a fictional character of the novel which has his name, and was written by Miguel de Cervantes Saavedra in the seventeenth century. It's one of the most important novels of the universal literature and probably the most important novel in the Spanish culture. It has inspired many writers from all times.